Configuration handling for subsequent layer 1 or layer 2 triggered mobility in dual connectivity

Abstract

A first candidate secondary base station receives, from a master base station, a secondary node modification request message comprising a first identifier of a first candidate primary secondary cell group cell (PSCell), of the first candidate secondary base station, for a first layer 1 or layer 2 triggered mobility (LTM) associated with a first PSCell change to the first candidate PSCell for a wireless device, a second identifier of a second candidate PSCell for a second LTM associated with a second PSCell change to the second candidate PSCell for the wireless device, wherein the second LTM is initiated by the first candidate secondary base station, a first LTM configuration identifier indicating a first configuration of the first LTM to the first candidate PSCell, and a second LTM configuration identifier indicating a second configuration of the second LTM to the second candidate PSCell.

The invention claimed is: 
     
         1 . A method comprising:
 receiving, by a first candidate secondary base station from a master base station, a secondary node modification request message comprising:
 a first identifier of a first candidate primary secondary cell group cell (PSCell), of the first candidate secondary base station, for a first layer 1 or layer 2 triggered mobility (LTM) associated with a first PSCell change to the first candidate PSCell for a wireless device; 
 a second identifier of a second candidate PSCell for a second LTM associated with a second PSCell change to the second candidate PSCell for the wireless device, wherein the second LTM is initiated by the first candidate secondary base station; 
 a first LTM configuration identifier indicating a first configuration of the first LTM to the first candidate PSCell; and 
 a second LTM configuration identifier indicating a second configuration of the second LTM to the second candidate PSCell; 
   receiving, from the master base station, a secondary node reconfiguration complete message indicating completion of the first LTM of the wireless device to the first PSCell; and   sending, to the wireless device, an LTM cell switch command medium access control control element (MAC CE) indicating a cell switch associated with the second LTM to the second candidate PSCell, wherein the LTM cell switch command MAC CE comprises a value based on the second LTM configuration identifier.   
     
     
         2 . The method of  claim 1 , wherein the second LTM is a subsequent LTM of the first LTM. 
     
     
         3 . The method of  claim 1 , wherein the second candidate PSCell is a PSCell of a second candidate secondary base station. 
     
     
         4 . The method of  claim 3 , wherein the master base station sends, to the second candidate secondary base station, a secondary node addition request message indicating an LTM. 
     
     
         5 . The method of  claim 4 , wherein the master base station receives, from the second candidate secondary base station, a secondary node addition request acknowledge message comprising the second identifier of the second candidate PSCell. 
     
     
         6 . The method of  claim 1 , wherein the first candidate secondary base station receives, from the master base station, a secondary node addition request message indicating one or more of the first LTM or the second LTM. 
     
     
         7 . The method of  claim 6 , wherein the first candidate secondary base station sends, to the master base station, a secondary node addition request acknowledge message comprising the first identifier of the first candidate PSCell. 
     
     
         8 . A first candidate secondary base station comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the first candidate secondary base station to:
 receive, from a master base station, a secondary node modification request message comprising:
 a first identifier of a first candidate primary secondary cell group cell (PSCell), of the first candidate secondary base station, for a first layer 1 or layer 2 triggered mobility (LTM) associated with a first PSCell change to the first candidate PSCell for a wireless device; 
 a second identifier of a second candidate PSCell for a second LTM associated with a second PSCell change to the second candidate PSCell for the wireless device, wherein the second LTM is initiated by the first candidate secondary base station; 
 a first LTM configuration identifier indicating a first configuration of the first LTM to the first candidate PSCell; and 
 a second LTM configuration identifier indicating a second configuration of the second LTM to the second candidate PSCell; 
   receive, from the master base station, a secondary node reconfiguration complete message indicating completion of the first LTM of the wireless device to the first PSCell; and   send, to the wireless device, an LTM cell switch command medium access control control element (MAC CE) indicating a cell switch associated with the second LTM to the second candidate PSCell, wherein the LTM cell switch command MAC CE comprises a value based on the second LTM configuration identifier.   
     
     
         9 . The first candidate secondary base station of  claim 8 , wherein the second LTM is a subsequent LTM of the first LTM. 
     
     
         10 . The first candidate secondary base station of  claim 8 , wherein the second candidate PSCell is a PSCell of a second candidate secondary base station. 
     
     
         11 . The first candidate secondary base station of  claim 10 , wherein the master base station sends, to the second candidate secondary base station, a secondary node addition request message indicating an LTM. 
     
     
         12 . The first candidate secondary base station of  claim 11 , wherein the master base station receives, from the second candidate secondary base station, a secondary node addition request acknowledge message comprising the second identifier of the second candidate PSCell. 
     
     
         13 . The first candidate secondary base station of  claim 8 , wherein the first candidate secondary base station receives, from the master base station, a secondary node addition request message indicating one or more of the first LTM or the second LTM. 
     
     
         14 . The first candidate secondary base station of  claim 13 , wherein the first candidate secondary base station sends, to the master base station, a secondary node addition request acknowledge message comprising the first identifier of the first candidate PSCell. 
     
     
         15 . A wireless device comprising one or more processors and memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
 receive, from a master base station, one or more radio resource control (RRC) reconfiguration messages, comprising:
 a first layer 1 or layer 2 triggered mobility (LTM) configuration identifier indicating a first configuration of a first LTM to a first candidate PSCell, of a first candidate secondary base station; and 
 a second LTM configuration identifier indicating a second configuration of a second LTM to a second candidate PSCell of a second candidate secondary base station, wherein the second LTM of the wireless device is initiated by the first candidate secondary base station that receives the second LTM configuration identifier from the master base station; 
   receive, from a source secondary base station, a first LTM cell switch command medium access control control element (MAC CE) indicating a first cell switch associated with the first LTM to the first candidate PSCell, wherein the first LTM cell switch command MAC CE comprises a first value based on first LTM configuration identifier;   transmit, to the master base station, a first RRC reconfiguration complete message indicating completion of the first LTM to the first candidate PSCell;   receive, from the first candidate secondary base station, a second LTM cell switch command MAC CE indicating a second cell switch associated with the second LTM to the second candidate PSCell, wherein the second LTM cell switch command MAC CE comprises a second value based on the second LTM configuration identifier; and   transmit, to the master base station, a second RRC reconfiguration complete message indicating completion of the second LTM to the second candidate PSCell.   
     
     
         16 . The wireless device of  claim 15 , wherein the second LTM is a subsequent LTM of the first LTM. 
     
     
         17 . The wireless device of  claim 15 , wherein the master base station sends, to the second candidate secondary base station, a secondary node addition request message indicating an LTM. 
     
     
         18 . The wireless device of  claim 17 , wherein the master base station receives, from the second candidate secondary base station, a secondary node addition request acknowledge message comprising the second identifier of the second candidate PSCell. 
     
     
         19 . The wireless device of  claim 15 , wherein the first candidate secondary base station receives, from the master base station, a secondary node addition request message indicating one or more of the first LTM or the second LTM. 
     
     
         20 . The wireless device of  claim 19 , wherein the first candidate secondary base station sends, to the master base station, a secondary node addition request acknowledge message comprising the first identifier of the first candidate PSCell.